CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Revenues	$ 6,300	$ 3,706
Cost of sales:
Cost of sales	3,765	2,218
Depreciation expense	277	354
Total cost of sales	4,042	2,572
Gross profit	2,258	1,134
Operating expenses:
Selling, general and administrative	1,995	1,911
Depreciation and amortization	68	77
Total operating expenses	2,063	1,988
Operating income (loss)	195	(854)
Other income:
Interest income, net	7	9
Gain on sale of property, plant and equipment	15	0
Total other income	22	9
Income (loss) before income taxes	217	(845)
Income tax expense	(5)	(5)
Net income (loss)	$ 212	$ (850)
Net income (loss) per share:
Basic	$ 0.02	$ (0.06)
Fully diluted	$ 0.02	$ (0.06)
Weighted-average shares outstanding:
Basic	13,511	13,436
Fully diluted	13,511	13,436